Addison c



(No Model.)

A. G. FLETCHER.

GRATE.

' No. 432,394. Patented July 15, 1890..

UNITED STATES PATENT OFFICE.

ADDISON c. FLETCHER, OF NEW YORK, N. Y.

GRATE.

SPECIFICATION forming part of Letters Patent No. 432,394, dated July 15,1890.

Application filed April 2, 1890. $oria1 No. 346,287. (No model.)

To all whom it may concern..-

Be it known that I, ADDISON O; FLETCHER, a citizen of the United States,residing at New York, in the county of New York and State of New York,have invented new and useful Improvements in Grates, of which thefollowing is a specification.

My invention relates to certain improvements in furnace grate-bars,whereby I provide a simple, novel, and economical con struction by whichthe user shall be enabled to replace any one or more of said'bars,should the same become injured or burned out, by new bars, withoutmaterial loss of time and without the necessity of sacrificing any ofthose portions of the grate which are still capable of service.

It is my purpose, also, to provide a grate for furnaces of all sorts, inwhich a removable or detachable fuel-bearing point composed of twoconnected sections is combined with the grate-bar in such manner as tonot only provide a broad base of support for the coal furnished to saidfurnace, but shall also aiford an increased draft of air, a morecomplete combustion, a more rapid generation of steam or heat, and amore perfect control of the temperature produced.

It is my purpose, also, to provide a gratebar having a simple andeconomical construction, wherein the sectional fuel-bearing points shallbe capable at any time of ready attachment to and detachment from saidbars, and whereby said points shall be positively interlocked with thegrate-bars and rendered readily separable therefrom in the event ofinjury or burning, to enable the user to substitute other points intheir place, any one of the latter being capable of removal, and itsplace being readily filled by apoint of duplicate formation, which may,if desired, be provided with extensions having an interlockingengagement with the blocks which engage the grate-bars, and having suchconstruction of the two interlocking portions of said blocks that theyshall be prevented from shifting one upon the other, and the cap orupper portion of each point shall be integral throughout the surfaceupon which the coal rests and burns.

It is a further purpose of my invention to .provide simple means wherebythe several grate-bars may be separated one from the other by equalintervals and to the several purposes specified the invention consistsin the several novel features of construction and new combinations ofparts, hereinafter fully set forth, and then definitely pointed out inthe claims following this specification.

To enable others skilled in theart to make, construct, and use my saidinvention, I will proceed to describe the same in detail, referencebeing had to the accompanying drawings, in which- Figure 1 is anelevation of a grate-bar having a series of fuel-supporting pointsmounted thereon.

Fig. 2 is a broken plan view showing the same, and showing the lateralext-ensions of the fuel-surfaces of the points. Fig. 3 is atransverseIsection of a single grate-bar, showing theconnection of thefuel-burning and supporting points and the manner of mounting the sameupon the grate bars. Fig. 4 is a detail perspective showing the form ofpoint seen in Fig. 3. Fig. 5 is a detail perspective showing thelocking-block. Fig. 6 is a figure showingin two opposite perspectivesmodified forms of the parts illustrated in Figs. 4 and 5. Fig. 7 is asimilar detail perspective view showing a further modification of thesame parts.

In the said drawings, the reference-numeral 1 designates the severalgrate-bars, which are all substantially parallel one with another[ Thesebars are of any suitable thickness and of such width as to accommodatethe construction hereinafter to be described.

In each grate-bar I form a series of openings 2, drilled through thesame, preferably upon a line slightly above the central longitudinalline of the bar, so as to enable said bars to receive studs 3, theopenings in the bars being of such size as to enable them to receive thesaid studs 3 and allow the latter to pass entirely through and projectfrom or beyond the opposite face of the bars, as shown in Fig. 3. Thesestuds 3 are formed upon the lower portions of each one of the sectionalmembers composing the interchangeable series of fuel-supporting points.The body-supporting sectional portion 5 is of substantially triangularform, though it may be of any other IOC preferred shape, and projectingfrom its face is a ledge or plate 5, (shown in Fig. 4,) which liessubstantially parallel with the stud 3 and rests upon the top of thegrate-bar 1. Rising from the top of said plate or ledge is a lug 6,(shown in Figs. 3 and t) and with this lug engages a loop 7, (shown inFig. 5,) said loop being formed upon a substantially triangular sectionor plate S, having at its lower end a half-round notch 91, which seatsupon the end of the stud 3, which projects through the bar 2 of thegrate. I may substitute for the lug (3, which rises vertically from thetop of the section 5, a horizon tally-proj e'cting lug 10, (shown inFig. (5,) and having two dovetailed or mortising ends 12, which engagewith counter-pointing portions 13 upon a section or plate 14, (shown inFig. 6,) and having, like the plate shown in Fig. 5, a halt-round recess15, similar to the recess 15 shown in Figs. 1 and t.) I may, however,substitute for the form referred to that shown in Fig. 7, wherein thesection 5 is provided with an offset having corrugations or teeth 16, asshown in Fig. 7. Over this section 5 I hook the hood 17, having adepending flange provided with corrugations or teeth 18, and provided,like the parts already described, with. the half-round opening or seat15, which seats upon the end of the stud In all these severalconstructions it will be readily understood that the gratebars by whichthe fuel-supporting points are supported may be formed of either cast orwrought iron,as choice or circumstances may require, but thefuel-supporting points are preferably formed of cast-iron.

\Vhile I may efiiect a separation of the grate-bar 1 by forming upon thepoints 7 the lateral extension 7, as shown in Figs. 2 and 3, I may alsopass one or more bolts 19 through the whole series of gratebars, asshown in Fig. 1, and upon these bolts turn a series of nuts 20, two ormore of said nuts being interposed between adjacent bars. I may alsoemploy both these means of spacin g or separating the grate-bars, eitherseparately or in conjunction one with the other. In order that thepoints may break joints, they may be formed of different lengths at theterminals of adjacent bars, as shown in Fig. 2, or such other andfamiliar construction may be employed as will effect the same result.

It will be understood that the several parts described are allinterchangeable,whereby in the event of any one or more becoming burnedout or otherwise injured they may be displaced and new parts substitutedwith pcrfeet ease and in the shortest possible time. Thus the wear ordestruction of the points does not necessitate the removal of thegratebars, and even in the event of one member of the twofoldpointbecoming useless for any reason this single part maybe replacedwithout involving the removal and substitution of any other portion ofthe grate, thus adding very greatly to the economy of the de vice inuse. I may broaden the fuel-supporting surfaces of the points by forminglateral extensions 7" upon each of the parts, as shown in dotted linesin Fig. 3.

\Vhat I claim as my invention is- 1. A grate-bar provided with removablefuel-supporting points, each composed of two detachably-conneetedsections, substantially as described.

2. A grate-bar provided with fuel-supporting points removably attachedto the grate bar below its top edge and each composed of twointerlocking sections embracing said bar, substantially as described.

3. The combination, with a gratebar, of fuel'supporting points, eachcomposed of two sections, one engaging the bar and the other engagingand supported by the bar-engaging section, substantially as described.

4. A gratebar having fuel-supporting points, each composed of twosections, one having a pin passing through the bar and the other restingon the pin and engaged with the pin-carrying section, substantially asdescribed.

5. A grate-bar having fuel -su pporting points, each composed of twosections, one resting on the upper edge of the bar and having a pinextending through the latter and the other resting on the pin andengaged with the pin-carrying section, substantially as described.

(i. A grate-bar having del achable fuel-supporting points, each of whichis composed of two sections abutting each other above the grate-bar,substantially as described.

7. The combination, with a grate-bar, of fuel-supporting points, eachcomposed of two sections one carried by the bar and having a lug and theother having a loop engaging the lug, substantially as-described.

S. The combination, with a grate-bar, of fuel-supporting points, eachcomposed of two sections, one having a lug and a pin and the otherresting on the pin and having a loop engaging the lug, substantially asdescribed.

In testimony whereof I have aflixed my signaturein presence of twowitnesses.

ADDISON C. FLETCHER. \V'itnesses:

J AMES A. RUTHERFORD, J. GRANVILLE Miners.

ITO

